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Re: Efficient code.

by merlyn (Sage)
on Jan 30, 2006 at 17:44 UTC ( #526501=note: print w/replies, xml ) Need Help??


in reply to Efficient code.

It's not clear from the context, but are you just looking for set intersection? I mean, if the comparison is merely "is this line of B also a line in A in its entirety", then the problem is trivial:
open A, "a" or die; my %in_a = map { $_, 1 } <A>; open B, "b" or die; while (<B>) { print if $in_a{$_}; }

-- Randal L. Schwartz, Perl hacker
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